Phosphorous is an essential nutrient for plants and a common ingredient in many fertilizers. However, the processing of phosphate rock to make phosphate-based fertilizer may leave radium (Ra-226) in the end product. The levels of Ra-226 vary depending upon the type of fertilizer blend and the origin of the phosphate rock, and can appear in vegetables grown with it.
To read more about potential radiation sources in and around your home, check out two EPA sites on the topic:
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